Shoe supporting jack



March 19, 1940. R. H. LAwsoN 2,194,360

sHoE SUPPORTING JACK Filed may 12, 1959 2 sheets-sheet 1 Allg .Wlll'lllllz l R. H. LAWSON SHOE SUPPORTING JACK March 19, 1940.

Filed llay l2, 1939 2 Sheetsheet 2 PatentedrMar. 19, 1940 l SHOE SUPPORTING .JACK

' `Robert lH. Lawson, Beverly, Mass., assigner to l i United Shoe Machinery Corporation, Borough of-Flemington, N. J., a corporation of New ,Jersey Application May 12, 1939, Serial No. 273,234 8 Claims. (C1. 122-427) The vpresent invention lrelates to shoe supporting 'jacks for use in machines usediin the manufacture of shoes, and is intended primarily as an improvement in the shoe supporting jack disclosed in applicants rprior Patent No. 1,999,298

dated-April 30, 1935.

The vobjects of the invention are to simplify 'andimprove certain of the mechanisms'disclosed yin' said patent, and more'particularly the mechanism for releasing the yshoe clamping mechanism,

" when a last is placed upon `a jack, the mechanism for resetting'th'e shoe clamping mechanism and the devices for locking the swinging cradle onl which'the shoe is supported from swinging movements' except whilethe machine in which the jack is used is in operation.

Withv the'above objects in view, a feature of the invention is embodied -in a `construction in which the pin which is depressed by the act of placing a `last on the heel support of `the jack to release the shoeclamping mechanism is arranged to act directly onthe actuating pawl of the jack resetting mechanism. In connection with this feature,i'means are provided for imparting an additional movement to the pawl as soon as it is disengaged `from the :heel support carrying slide so` vas rto prevent the pin from being engaged by the pawl during vthe 4movement of 'theheel support' slide 4toi'vards the toe support in clamping the shoe. .Also in connection with this feature means are' provided for holding the pawl out of contact v vwithtlfie pin or with the slide during the return movement of the pawl while 'the machine is in operation and also 'for movingthe pawl into a positionto engagev the slide at the start of the l advancing movement of the pawl.

r Another feature of the present invention is embodiedl in a-iconstruction comprising a, locking mechanism connected to the slide carrying the heel-support and, arranged to be actuated by the pawl during its advancing movement to center thei.swi`nging vcradle .and lock the cradle from swinging movements;

, Other features of the invention are embodied in certain'novel constructions and arrangements of parts hereinafter described and claimed, the advantages of which will be obvious to those skilled in the 4art from the following description, taken vin `connectionI with the accompanying drawings in which Fig.` l is a view in side eleva tionpartly in section, of the upper portion of a shoe supporting jack lembodying the present in- VentionyFig. 2 is a sectional plan view, taken on the line 2-2 of Fig.` v1; .Fig is a detail vertical sectional view, taken on the line 33 of Fig. 1;

Fig. 4 is a detail plan View illustrating a frictional connection between the actuating pawl bar of the clamp resetting mechanism and a supporting lever; Fig. 5 is a View similar to Fig. 1, but with the shoe illustrated in clamped position and with the pawl bar at the limit of its retracting movement; Fig. 6 is a View similar to Fig. 5, butl with the pawl bar in the position it assumes just vprior to engaging the shoulder on the slide; and Fig. '7 is a vertical sectional view, taken on the line L-'l ofFig. 6. l v

The shoe supporting jack illustrated in the drawings comprises a jack frame 8, a cradle I0 pivotally mounted in the jack frame to swing about anaxis extending` close to the bottom of a. supported shoe lengthwisev of the shoe, a` heel supporting last pin I2 projecting from a slide I4 mounted in the cradle I0, a ltoe support for the shoe comprising toe supporting grips IB, and a toegage I8, said toe grips and toe gage being also mounted on the cradle Il. When the parts are in position to receive the shoe, as illustrated in Figure 1, the heel support I2 is held against movement towards the toe support by means of a lug 20 projecting yfromy a pawl bar 22 and engaging a shoulder on the slide I4. A spring 24 connected at one endA to the cradle It and at the other end tothe slide'I4 moves the slide with the heel supporting Ilast pin I2 towards the toe rest to clamp the shoe on the jack, as illustrated o in Fig. 5, as soon as the pawl is moved out of engagement with the shoulder on the slide. To re-` lease the slide when a shoe is placed on the jack, a spring supported plunger 2t is mounted in the last pin I2 andis arranged, when depressed by the placing volfa shoe on the jack, to move the pawl 22 out of engagement with the shoulder on the slide I4.

As so far described, the construction and arrangement of the parts is substantially the same A as in the jack disclosed in applicants prior Patent No. 1,999,298 above referred to, and in applicants pending application Serial No. 231,750 led Sepn tomber 26, 1938. In the present construction, however, the spring supported plunger' 26, instead of acting on the pawl through an intervening lever, is arranged to act directly on the pawl scribed, and in order to prevent the lug 20 of the pawl from being engaged by the lower endl of the plunger 26 during the movement of the slide towards the toe rest, after being released by the downward movement ofthe plunger, a spring pressed curved lever 40 is provided mounted in the jack frame and arranged to engage at its upper end with an inclined surface at the rear end of the pawl 22 and impart a further downward movement to the pawl as soon as it is movedv porting the pawl 22 comprises a supporting lever @2 pivotally mounted on the jack frame and provided with a vertical portion extending down- 'y wardly'between limiting stops fili and d5 and with a horizontal portion having a frictional sliding engagement with the pawl 22. As best shown in igure 4, the connection between the horizontal arm of the lever l2 and the pawl 22 comprises a pivot pin 4S extending through friction plates fifi on opposite sides or" the pawl and through` a longitudinal slot 58 in the pawl. A frictional engagement of the plates d8 with the pawl 22 is secured by springs 52 mounted on opposite -g ends of a pin 541 extending through the plates i8 and through the slot 5B, said spring being located between a plate i8 and a nut 5E on the outer end of the pin 5d. An upwardly extending forked portion of the lever 42 acts as a lateral guide for the pawl.

Briefly stated, the operation of the mechanism above described is as foliows. When the machine in which the jack is used is at rest with the jackl in position to receive a shoe, the mecha-l nism of the jack is in the position illustrated in Figure l. Upon placing a shoe on the jack, the plunger 2S is depressed, thereby moving the pawl E2 downwardly to disengage the lug 20 on the pawl from the slide I4, and bringing it into a position so that the spring pressed lever lil continues the downward movement of the pawl to carry the lug 29 out of the path of the lower end of the plunger 25 as the slide Ill moves towards the toe rest into the position indicated vin Figure 5. During the operation on the shoe, the pulley 33 is rotated in a clockwise direction by mechanism which may be the same as that disclosed in applicants pending application, and l during this clockwise rotation, the pawl 22 is moved to the right. During the movement of the pawl 22 to the right, the frictional engagement between. the horizontal arm of the lever 42 and the pawl holds the lever d2 in a position in which the downwardly extending portion of the lever is in engagement with the stop li, and thereby the pawl 22 is heid in its depressed position and the lug Zt of the pawl passes -beneath thelower end of the plunger 26 and beyond the shoulder on the siide ifi, as indicated in Figure 5. At the conclusion of the operation on the shoe, the pulley 83 may be rotated in the opposite direction as in the machine of applicants pending application, and during this rotation the pawl 22 is movedv towards the left. During the rst part of this movement, the lever i2 is swung about its pivot, as indicated in Figure 6", by reason of the frictional connection between the horizontal portion of the lever and the-pawl. Thereby the pawl is raised into a position where continued movement of the pawl to the left will cause the lug on the pawl to engage the shoulder on the heel support carrying slide I4. Continued movementv of the pawl to the left brings the heel support carrying slide I4 to the position indicated in Figure l, and thereby unclamps the shoe on the jack. l

The improved means illustrated in the draw-y i ings for locking the cradle I0 from swinging` movements except while the machine in which..` the jack is used is in operation comprises a lock-` ing device mounted on the` slide carrying j the heel support and arranged to be v,engaged bythe pawl which actuates the slide to unclamp the shoe, This locking device comprises a V-shapedV s guide indicated at 58 rigidly secured to the underside of the slidefI adjacent the plunger 26;

This V-shaped guide inthe construction illustrated provides the shoulder 'on the slide I4.

which cooperates with the projecting lug 20 of the pawl 22. moves into engagement with the guide 58, the pressure of the guide against the lug, due to the As the projection 20 of the pawlk action of the spring 24,` centers the guide and y y with it the slide I 4 andthe cradle I0 in which the siide is mounted, and effectively prevents jack frame so long as thelug 20fand guide 58 f remain in engagement.

The nature and scope of the invention having been indicated, and an embodiment of the several features of the invention having been spei cically described, what is claimed is:

1. In a machine for-use Vin the manufacture clamping means mounted on the cradle comprising a toe rest, a heel support,l a slide on which the heel support is mounted, la spring tending to move theslide towards the toe rest to clampthe shoe, a pawl mounted on the jack frame arranged to engage a rshoulder on the. slide, means for actuating the pawl to move the slide away from the toe rest, and a locking device on the slide arrangedvto be engaged by the pawl to lock cradle from swinging movement.

2. In a machine for usein the manufacture'. y.

of slices, a shoe supporting jack, comprising a' the jack frame, a shoe sup-porting cradle' mountedvk in the jack frame to swing about an axis extending longitudinally of a shoel on the c'radle'infA I proximity to the plane of thev shoesole,I sole clamping means mounted on `the cradlecompris ing a toe rest, a'heel support, a slidejon which the heel support is mounted,v a springtending to move the slide towards the toe rest tov clamp the shoe, a pawl mounted on the jack framev ar-V ranged to engage a shoulder on the slide, means;

for actuating the pawl to movethe slide away from the toe rest, and a vV-shaped' guideon the slide arranged to beengaged'by' the pawlfto center the cradle and lock it from swinging movement.

means mounted on the jack comprisi-ng'a toe rest, a heel support, a slide on which the heelsupport is mounted, a springv tending to. move the slide 3. In a machine for use in the manufacture of. shoes ,a shoe supporting fjack, shoe clamping 15 -v-ik l.

te any swinging movement of the cradle on the I f a heel support, a slide on which the heel support a pin on the 'slide arranged to engage the pawl i and to be actuated by a last placed on the heel support to disengage the pawl from said shoulder, i

and means for moving the pawl when so disengaged out of the path traversed by the pin during the shoe clamping movement of the slide.

4. In a machine for use in the manufacture oi Shoes, a shoe supporting jack, shoe clamping,

means mounted on the jack comprising a toe rest,

is mounted, aspring tending tov move the slide towards the toe rest to clamp the shoe, a pawl y bar provided, with a shoulder arranged to engage a shoulder on the slide, a pin on the slide arranged to engage the pawl bar and to be actuated by a last placed on the heel support to disengage the pawl bar from the slide, means for reciprocating the pawl bar, a supporting lever arranged to move the bar towards and away from a position to engage the shoulder on the slide, a frictional sliding connection between theA supporting lever and bar and stopsto limit the movement of the supporting lever. f v

5. In a machine for use in the manufacture of shoes, a shoe supporting jack, shoe clamping means mountedv on the jack comprising a toe rest, a heel support, a slide on which the heel support yis mounted, a spring tending to move the slide towards the toe rest to clamp the shoe,` a pawl mounted on the jack frame arranged to engage a shoulder on the slide, ,means for actuating the pawl to movev the slide away from the toe rest, a pin on the slide arranged to engage 4 the pawl and to be actuated by a last placed on the heel support to disengage thepawl from said shoulder, and a spring pressed lever arranged to movethe pawl when so disengaged out of theV path traversed by the pin during the shoe clamping movement lof the slide.

6. In a machine for' use in the manufacture of shoes, ashoe supporting jack, shoe clamping means mounted on the jack comprising a toe rest, a heel support, a slide on which the heel ysupport is mounted, a spring tending to move the slidev towards theftoe rest to clamp the shoe, a pawl bar provided with a shoulder arranged to engage a shoulder on the slide, ay pin on the slide arranged to engage the pawl bar and to be actuated by a last placed on the heel support todisengage the pawl bar from the slide, means forreciproleating the pawl bar including anl actuating lever l to which the bar is pivotally` connected, a supporting lever arranged to be actuated by the reciprocating movements of the bar to move the bar towards and away from a position to engage shoulderl on the slide, a frictional sliding connection between the supporting `lever and bar,

and stops to limit the movement of the supporting lever. i v

'7. In a machine for use in the manufacture of shoes, a shoe supporting jack, shoe clamping means mounted on the jack comprising a toe rest, a'heel support, aslide on which the heel actuated by a last placed on the heel support to disengage the pawlbar `from the slide, means for reciprocating the pawl bar arranged to impart an advancing movement to thebar to move the slide away from the toe rest and a return movement, and means for holding the `bar out of contact with the pin during its return movement. l s f v 8. In a machine for usein the manufacture o shoes, a shoe supporting jack, shoe ,clamping means mounted onthe jack comprising a toe rest, a 'heel support, a slide on which the heel support is mounted, a spring tending to vmove the slide towards the toe rest to clamp the shoe, a pawl bar provided witha shoulder arranged to engage a shoulder on the slide, a pin on the slide arranged to engage the'pawl bar andato be actuated by a last placed on the heel support to disengage the pawl bar from the slide, means `for reciprocating the pawl bar, arranged to impart an advancing movement to the bar to move the slide away from 'the toe rest and a return movement, and means actuated by thereciprocating move. ments of the bar for moving the'y bar towards and laway from a position to engage the shoulderon the slide.

ROBERT n. LAWSON.

t CERTIFICATE OE CORRECTION. Patent No. 2,19Lh56o. Mar-Ch 19, 191m.

ROBERT E. LAWSON.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, seoond Column, line 59, Claim 2, for "sole" second occurrence, read -shoe; and that the said Letters Patent should be read with this correction therein that the same may conformto the record of the case in the` Patent Offiee.

Signed and sealed this 25th day of June, A. D. 19M).

Henry Van Ar-sdale,

(Seal) Acting Commissioner of Patents. 

